How does the split comfort preference work?

The Queen and King size mattresses (including their Extra length options) the inner foam layers are split in half, allowing you to adjust the left side to a specific firmness as well as the right side to a different firmness. The split also allows for zero motion transfer, for disturb free sleeping. The thick luxurious cover allows for a seamless transition between the two inner foam layers. So, you won’t feel the groove.

edge gap ridge